1
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Leets KA, Pacherille A, Chisholm JD. Tandem Oxidation-Bromination of Allylic Alcohols with a TEMPO-Oxone-Et4NBr Reactant System. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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2
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Alvi S, Jayant V, Ali R. Applications of Oxone® in Organic Synthesis: An Emerging Green Reagent of Modern Era. ChemistrySelect 2022. [DOI: 10.1002/slct.202200704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shakeel Alvi
- Department of Chemistry, Jamia Millia Islamia, Jamia Nagar, Okhla New Delhi 110025 India
| | - Vikrant Jayant
- Department of Chemistry, Jamia Millia Islamia, Jamia Nagar, Okhla New Delhi 110025 India
| | - Rashid Ali
- Department of Chemistry, Jamia Millia Islamia, Jamia Nagar, Okhla New Delhi 110025 India
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3
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Acid Catalyzed N-Alkylation of Pyrazoles with Trichloroacetimidates. ORGANICS 2022. [DOI: 10.3390/org3020009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
N-Alkyl pyrazoles are important heterocycles in organic and medicinal chemistry, demonstrating a wide range of biological activity. A new method for the N-alkylation of pyrazoles has been developed using trichloroacetimidate electrophiles and a Brønsted acid catalyst. These reactions provide ready access to N-alkyl pyrazoles which are present in a variety of medicinally relevant lead structures. Benzylic, phenethyl and benzhydryl trichloroacetimidates provide good yields of the N-alkyl pyrazole products. Unsymmetrical pyrazoles provide a mixture of the two possible regioisomers, with the major product being controlled by sterics. This methodology provides an alternative to other alkylation methods that require strong base or high temperature.
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4
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Van Kerrebroeck R, Horsten T, Stevens CV. BROMIDE OXIDATION: A SAFE STRATEGY FOR ELECTROPHILIC BROMINATIONS. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200310] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Tomas Horsten
- Ghent University: Universiteit Gent Green Chemistry and Technology BELGIUM
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5
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Mu S, Li H, Wu Z, Peng J, Chen J, He W. Electrocatalytic Three-Component Synthesis of 4-Bromopyrazoles from Acetylacetone, Hydrazine and Diethyl Bromomalonate. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202211002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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6
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Chen JY, Li HX, Mu SY, Song HY, Wu ZL, Yang TB, Jiang J, He WM. Electrocatalytic three-component synthesis of 4-halopyrazoles with sodium halide as the halogen source. Org Biomol Chem 2022; 20:8501-8505. [DOI: 10.1039/d2ob01612e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The first example of the electrocatalytic multicomponent synthesis of 4-chloro/bromo/iodopyrazoles from hydrazines, acetylacetones and sodium halides under chemical oxidant- and external electrolyte-free conditions has been developed.
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Affiliation(s)
- Jin-Yang Chen
- Postdoctoral Mobile Station of Basic Medical Sciences, Hengyang Medical School, University of South China, Hengyang 421001, China
- School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China
| | - Hong-Xia Li
- Postdoctoral Mobile Station of Basic Medical Sciences, Hengyang Medical School, University of South China, Hengyang 421001, China
| | - Si-Yu Mu
- Postdoctoral Mobile Station of Basic Medical Sciences, Hengyang Medical School, University of South China, Hengyang 421001, China
| | - Hai-Yang Song
- School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China
| | - Zhi-Lin Wu
- School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China
| | - Tian-Bao Yang
- School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China
| | - Jun Jiang
- School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China
| | - Wei-Min He
- School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China
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7
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A convenient approach for the electrochemical bromination and iodination of pyrazoles. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2021. [DOI: 10.1515/znb-2021-0148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Electrochemical bromination and iodination of some pyrazoles were investigated under constant-current (CC) electrolysis in an undivided electrochemical cell. Anodic oxidation of KX salt produces X2
in-situ which can be consumed as an expedient electrophile in pyrazoles aromatic electrophilic substitution reactions or may participate in an X–N coupling reaction with electrochemically catalyzed pyrazolesox to form the halogenated pyrazoles. All reactions proceeded without the need to use any hazardous reagents or catalysts. The reaction conditions are mild and environmentally compatible.
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8
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Kato T, Okada Y, Fujii Y, Uyanik M, Ishihara K. Oxidative Ritter‐type Chloroamidation of Alkenes Using NaCl and Oxone. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Takehiro Kato
- Graduate School of Engineering Nagoya University Chikusa Nagoya 464-8603 Japan
| | - Yuya Okada
- Graduate School of Engineering Nagoya University Chikusa Nagoya 464-8603 Japan
| | - Yuto Fujii
- Graduate School of Engineering Nagoya University Chikusa Nagoya 464-8603 Japan
| | - Muhammet Uyanik
- Graduate School of Engineering Nagoya University Chikusa Nagoya 464-8603 Japan
| | - Kazuaki Ishihara
- Graduate School of Engineering Nagoya University Chikusa Nagoya 464-8603 Japan
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9
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Krake EF, Baumann W. Selective Oxidation of Clopidogrel by Peroxymonosulfate (PMS) and Sodium Halide (NaX) System: An NMR Study. Molecules 2021; 26:5921. [PMID: 34641465 PMCID: PMC8512727 DOI: 10.3390/molecules26195921] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 09/23/2021] [Accepted: 09/25/2021] [Indexed: 11/17/2022] Open
Abstract
A selective transformation of clopidogrel hydrogen sulfate (CLP) by reactive halogen species (HOX) generated from peroxymonosulfate (PMS) and sodium halide (NaX) is described. Other sustainable oxidants as well as different solvents have also been investigated. As result of this study, for each sodium salt the reaction conditions were optimized, and four different degradation products were formed. Three products were halogenated at C-2 on the thiophene ring and have concomitant functional transformation, such as N-oxide in the piperidine group. A halogenated endo-iminium product was also observed. With this condition, a fast preparation of known endo-iminium clopidogrel impurity (new counterion) was reported as well. The progress of the reaction was monitored using nuclear magnetic resonance spectroscopy as an analytical tool and all the products were characterized by 1D-, 2D-NMR and HRMS.
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Affiliation(s)
| | - Wolfgang Baumann
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Straße 29a, 18059 Rostock, Germany;
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10
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Vanammoole L, Kommera R, Hariprasad Kurma S, Rao Vaidya J, Raju Bhimapaka C. Regioselective Halogenation of 2
H
‐Chromenones Promoted by Oxone and NaX: A Facile Approach for the Preparation of Halochromenones and 2
H
‐Chromenone Natural Products. ChemistrySelect 2020. [DOI: 10.1002/slct.202000908] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Lakshmireddy Vanammoole
- Department of Organic Synthesis & Process ChemistryCSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- AcSIR-Postal Staff College Area, Sector 19Kamla Nehru Nagar,Ghaziabad Uttar Pradesh 201002 India
| | - Rajkumar Kommera
- Department of Organic Synthesis & Process ChemistryCSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- AcSIR-Postal Staff College Area, Sector 19Kamla Nehru Nagar,Ghaziabad Uttar Pradesh 201002 India
| | - Siva Hariprasad Kurma
- Department of Organic Synthesis & Process ChemistryCSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- AcSIR-Postal Staff College Area, Sector 19Kamla Nehru Nagar,Ghaziabad Uttar Pradesh 201002 India
| | - Jayathirtha Rao Vaidya
- Fluoro AgrochemicalsCSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- AcSIR-Postal Staff College Area, Sector 19Kamla Nehru Nagar,Ghaziabad Uttar Pradesh 201002 India
| | - China Raju Bhimapaka
- Department of Organic Synthesis & Process ChemistryCSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
- AcSIR-Postal Staff College Area, Sector 19Kamla Nehru Nagar,Ghaziabad Uttar Pradesh 201002 India
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11
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Unprecedented Formation of 2‐Chloro‐5‐(2‐chlorobenzyl)‐4,5,6,7‐tetrahydrothieno[3,2‐c]pyridine 5‐oxide via Oxidation‐Chlorination Reaction Using Oxone: A Combination of Synthesis and 1D‐2D NMR Studies. ChemistrySelect 2019. [DOI: 10.1002/slct.201903556] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Wang CM, Du JY, Zhang JY, Tang KX, Gao TH, Xu YG, Sun LP. Regioselective bromination of aryl ureas with Phenyliodine(III) diacetate and potassium bromide. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130621] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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Van Kerrebroeck R, Naert P, Heugebaert TSA, D'hooghe M, Stevens CV. Electrophilic Bromination in Flow: A Safe and Sustainable Alternative to the Use of Molecular Bromine in Batch. Molecules 2019; 24:E2116. [PMID: 31167456 PMCID: PMC6600453 DOI: 10.3390/molecules24112116] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 05/30/2019] [Accepted: 06/01/2019] [Indexed: 11/26/2022] Open
Abstract
Bromination reactions are crucial in today's chemical industry since the versatility of the formed organobromides makes them suitable building blocks for numerous syntheses. However, the use of the toxic and highly reactive molecular bromine (Br2) makes these brominations very challenging and hazardous. We describe here a safe and straightforward protocol for bromination in continuous flow. The hazardous Br2 or KOBr is generated in situ by reacting an oxidant (NaOCl) with HBr or KBr, respectively, which is directly coupled to the bromination reaction and a quench of residual bromine. This protocol was demonstrated by polybrominating both alkenes and aromatic substrates in a wide variety of solvents, with yields ranging from 78% to 99%. The protocol can easily be adapted for the bromination of other substrates in an academic and industrial environment.
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Affiliation(s)
- Reinout Van Kerrebroeck
- SynBioC research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Pieter Naert
- SynBioC research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Thomas S A Heugebaert
- SynBioC research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Matthias D'hooghe
- SynBioC research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Christian V Stevens
- SynBioC research Group, Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
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14
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Rogers DA, Bensalah AT, Espinosa AT, Hoerr JL, Refai FH, Pitzel AK, Alvarado JJ, Lamar AA. Amplification of Trichloroisocyanuric Acid (TCCA) Reactivity for Chlorination of Arenes and Heteroarenes via Catalytic Organic Dye Activation. Org Lett 2019; 21:4229-4233. [DOI: 10.1021/acs.orglett.9b01414] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- David A. Rogers
- Department of Chemistry and Biochemistry, The University of Tulsa, 800 South Tucker Drive, Tulsa, Oklahoma 74104, United States
| | - Adam T. Bensalah
- Department of Chemistry and Biochemistry, The University of Tulsa, 800 South Tucker Drive, Tulsa, Oklahoma 74104, United States
| | - Alvaro Tomas Espinosa
- Department of Chemistry and Biochemistry, The University of Tulsa, 800 South Tucker Drive, Tulsa, Oklahoma 74104, United States
| | - John L. Hoerr
- Department of Chemistry and Biochemistry, The University of Tulsa, 800 South Tucker Drive, Tulsa, Oklahoma 74104, United States
| | - Fares H. Refai
- Department of Chemistry and Biochemistry, The University of Tulsa, 800 South Tucker Drive, Tulsa, Oklahoma 74104, United States
| | - Amy K. Pitzel
- Department of Chemistry and Biochemistry, The University of Tulsa, 800 South Tucker Drive, Tulsa, Oklahoma 74104, United States
| | - Juan J. Alvarado
- Department of Chemistry and Biochemistry, The University of Tulsa, 800 South Tucker Drive, Tulsa, Oklahoma 74104, United States
| | - Angus A. Lamar
- Department of Chemistry and Biochemistry, The University of Tulsa, 800 South Tucker Drive, Tulsa, Oklahoma 74104, United States
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15
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Uyanik M, Sahara N, Ishihara K. Regioselective Oxidative Chlorination of Arenols Using NaCl and Oxone. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801063] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Muhammet Uyanik
- Graduate School of Engineering; Nagoya University; Furo-cho 464-8603 Chikusa, Nagoya Japan
| | - Naoto Sahara
- Graduate School of Engineering; Nagoya University; Furo-cho 464-8603 Chikusa, Nagoya Japan
| | - Kazuaki Ishihara
- Graduate School of Engineering; Nagoya University; Furo-cho 464-8603 Chikusa, Nagoya Japan
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